FreeRTOS-RISCV/FreeRTOSv10.2.1/FreeRTOS/Demo/Common/ethernet/FreeRTOS-uIP/psock.c

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/*
* Copyright (c) 2004, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the uIP TCP/IP stack
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: psock.c,v 1.1 2007/01/04 11:06:40 adamdunkels Exp $
*/
#include <stdio.h>
#include <string.h>
#include "uipopt.h"
#include "psock.h"
#include "uip.h"
#define STATE_NONE 0
#define STATE_ACKED 1
#define STATE_READ 2
#define STATE_BLOCKED_NEWDATA 3
#define STATE_BLOCKED_CLOSE 4
#define STATE_BLOCKED_SEND 5
#define STATE_DATA_SENT 6
/*
* Return value of the buffering functions that indicates that a
* buffer was not filled by incoming data.
*
*/
#define BUF_NOT_FULL 0
#define BUF_NOT_FOUND 0
/*
* Return value of the buffering functions that indicates that a
* buffer was completely filled by incoming data.
*
*/
#define BUF_FULL 1
/*
* Return value of the buffering functions that indicates that an
* end-marker byte was found.
*
*/
#define BUF_FOUND 2
/*---------------------------------------------------------------------------*/
static void buf_setup( struct psock_buf *buf, u8_t *bufptr, u16_t bufsize )
{
buf->ptr = bufptr;
buf->left = bufsize;
}
/*---------------------------------------------------------------------------*/
static u8_t buf_bufdata( struct psock_buf *buf, u16_t len, u8_t **dataptr, u16_t *datalen )
{
( void ) len;
if( *datalen < buf->left )
{
memcpy( buf->ptr, *dataptr, *datalen );
buf->ptr += *datalen;
buf->left -= *datalen;
*dataptr += *datalen;
*datalen = 0;
return BUF_NOT_FULL;
}
else if( *datalen == buf->left )
{
memcpy( buf->ptr, *dataptr, *datalen );
buf->ptr += *datalen;
buf->left = 0;
*dataptr += *datalen;
*datalen = 0;
return BUF_FULL;
}
else
{
memcpy( buf->ptr, *dataptr, buf->left );
buf->ptr += buf->left;
*datalen -= buf->left;
*dataptr += buf->left;
buf->left = 0;
return BUF_FULL;
}
}
/*---------------------------------------------------------------------------*/
static u8_t buf_bufto( register struct psock_buf *buf, u8_t endmarker, register u8_t **dataptr, register u16_t *datalen )
{
u8_t c;
while( buf->left > 0 && *datalen > 0 )
{
c = *buf->ptr = **dataptr;
++ *dataptr;
++buf->ptr;
-- *datalen;
--buf->left;
if( c == endmarker )
{
return BUF_FOUND;
}
}
if( *datalen == 0 )
{
return BUF_NOT_FOUND;
}
while( *datalen > 0 )
{
c = **dataptr;
-- *datalen;
++ *dataptr;
if( c == endmarker )
{
return BUF_FOUND | BUF_FULL;
}
}
return BUF_FULL;
}
/*---------------------------------------------------------------------------*/
static char send_data( register struct psock *s )
{
if( s->state != STATE_DATA_SENT || uip_rexmit() )
{
if( s->sendlen > uip_mss() )
{
uip_send( s->sendptr, uip_mss() );
}
else
{
uip_send( s->sendptr, s->sendlen );
}
s->state = STATE_DATA_SENT;
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static char data_acked( register struct psock *s )
{
if( s->state == STATE_DATA_SENT && uip_acked() )
{
if( s->sendlen > uip_mss() )
{
s->sendlen -= uip_mss();
s->sendptr += uip_mss();
}
else
{
s->sendptr += s->sendlen;
s->sendlen = 0;
}
s->state = STATE_ACKED;
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
PT_THREAD( psock_send ( register struct psock *s, const char *buf, unsigned int len ) )
{
PT_BEGIN( &s->psockpt );
/* If there is no data to send, we exit immediately. */
if( len == 0 )
{
PT_EXIT( &s->psockpt );
}
/* Save the length of and a pointer to the data that is to be
sent. */
s->sendptr = ( u8_t * ) buf;
s->sendlen = len;
s->state = STATE_NONE;
/* We loop here until all data is sent. The s->sendlen variable is
updated by the data_sent() function. */
while( s->sendlen > 0 )
{
/*
* The condition for this PT_WAIT_UNTIL is a little tricky: the
* protothread will wait here until all data has been acknowledged
* (data_acked() returns true) and until all data has been sent
* (send_data() returns true). The two functions data_acked() and
* send_data() must be called in succession to ensure that all
* data is sent. Therefore the & operator is used instead of the
* && operator, which would cause only the data_acked() function
* to be called when it returns false.
*/
PT_WAIT_UNTIL( &s->psockpt, data_acked(s) & send_data(s) );
}
s->state = STATE_NONE;
PT_END( &s->psockpt );
}
/*---------------------------------------------------------------------------*/
PT_THREAD( psock_generator_send ( register struct psock *s, unsigned short ( *generate ) ( void * ), void *arg ) )
{
PT_BEGIN( &s->psockpt );
/* Ensure that there is a generator function to call. */
if( generate == NULL )
{
PT_EXIT( &s->psockpt );
}
/* Call the generator function to generate the data in the
uip_appdata buffer. */
s->sendlen = generate( arg );
s->sendptr = uip_appdata;
s->state = STATE_NONE;
do
{
/* Call the generator function again if we are called to perform a
retransmission. */
if( uip_rexmit() )
{
generate( arg );
}
/* Wait until all data is sent and acknowledged. */
PT_WAIT_UNTIL( &s->psockpt, data_acked(s) & send_data(s) );
} while( s->sendlen > 0 );
s->state = STATE_NONE;
PT_END( &s->psockpt );
}
/*---------------------------------------------------------------------------*/
u16_t psock_datalen( struct psock *psock )
{
return psock->bufsize - psock->buf.left;
}
/*---------------------------------------------------------------------------*/
char psock_newdata( struct psock *s )
{
if( s->readlen > 0 )
{
/* There is data in the uip_appdata buffer that has not yet been
read with the PSOCK_READ functions. */
return 1;
}
else if( s->state == STATE_READ )
{
/* All data in uip_appdata buffer already consumed. */
s->state = STATE_BLOCKED_NEWDATA;
return 0;
}
else if( uip_newdata() )
{
/* There is new data that has not been consumed. */
return 1;
}
else
{
/* There is no new data. */
return 0;
}
}
/*---------------------------------------------------------------------------*/
PT_THREAD( psock_readto ( register struct psock *psock, unsigned char c ) )
{
PT_BEGIN( &psock->psockpt );
buf_setup( &psock->buf, ( u8_t * ) psock->bufptr, psock->bufsize );
/* XXX: Should add buf_checkmarker() before do{} loop, if
incoming data has been handled while waiting for a write. */
do
{
if( psock->readlen == 0 )
{
PT_WAIT_UNTIL( &psock->psockpt, psock_newdata(psock) );
psock->state = STATE_READ;
psock->readptr = ( u8_t * ) uip_appdata;
psock->readlen = uip_datalen();
}
} while( (buf_bufto(&psock->buf, c, &psock->readptr, &psock->readlen) & BUF_FOUND) == 0 );
if( psock_datalen(psock) == 0 )
{
psock->state = STATE_NONE;
PT_RESTART( &psock->psockpt );
}
PT_END( &psock->psockpt );
}
/*---------------------------------------------------------------------------*/
PT_THREAD( psock_readbuf ( register struct psock *psock ) )
{
PT_BEGIN( &psock->psockpt );
buf_setup( &psock->buf, ( u8_t * ) psock->bufptr, psock->bufsize );
/* XXX: Should add buf_checkmarker() before do{} loop, if
incoming data has been handled while waiting for a write. */
do
{
if( psock->readlen == 0 )
{
PT_WAIT_UNTIL( &psock->psockpt, psock_newdata(psock) );
printf( "Waited for newdata\n" );
psock->state = STATE_READ;
psock->readptr = ( u8_t * ) uip_appdata;
psock->readlen = uip_datalen();
}
} while( buf_bufdata(&psock->buf, psock->bufsize, &psock->readptr, &psock->readlen) != BUF_FULL );
if( psock_datalen(psock) == 0 )
{
psock->state = STATE_NONE;
PT_RESTART( &psock->psockpt );
}
PT_END( &psock->psockpt );
}
/*---------------------------------------------------------------------------*/
void psock_init( register struct psock *psock, char *buffer, unsigned int buffersize )
{
psock->state = STATE_NONE;
psock->readlen = 0;
psock->bufptr = buffer;
psock->bufsize = buffersize;
buf_setup( &psock->buf, ( u8_t * ) buffer, buffersize );
PT_INIT( &psock->pt );
PT_INIT( &psock->psockpt );
}
/*---------------------------------------------------------------------------*/